A new labor agreement between AMR Corp. and the Transport Workers Union (TWU) expected to be released later today could mirror an accord recently agreed between the union and US Airways that would take effect should the Tempe, Ariz.-based airline acquire its rival. The TWU, the largest collective bargaining group at AMR’s American Airlines division, earlier this month joined the Allied Pilots Association and the Association of Professional Flight Attendants in supporting contract terms with US Airways just days before AMR began arguing its case before a bankruptcy judge to dismiss its current labor contracts ...